75180 Super Ringer w/ AC Adapter Super phone ringer Adjustable super loud ringer (95+dB) lets you know when your phone is ringing Never miss another call Bright red visual ring flasher (visually alerts you to an incoming phone call) Adjustable ring volume control Adjustable ring tone control (250 to1200 Hz) lets you set the tone level to best suit your hearing Choice of four distinct ring patterns to suit your preference Dual modular phone jacks for easy connection to a standard analog telephone AC powered with rechargeable battery backup (4 AA nickel cadmium rechargeable batteries not included) White